Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a shell; the plurality of battery cells are arranged in the shell; the combination part is arranged to be coupled to electric equipment for transmitting electric energy; a coupling portion including: a terminal assembly configured to be electrically coupled with an electrical device; the supporting part at least provides support for the connection of the electric equipment and the battery pack; the supporting part comprises a supporting cavity and a reinforcing piece contained in the supporting cavity. The reinforcing member and the housing are made of the same material. The battery pack is higher in strength and convenient to recycle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric tools, in particular to a battery pack. BACKGROUND

[0002] At present, tools widely used in various scenes such as gardens and buildings mostly use lithium batteries to realize energy supply. One of the focuses in lithium battery technology is safety, which includes both microscopic safety, for example, which may be related to the positive and negative materials of the battery cell, and macroscopic safety, for example, which may involve waterproofing, insulation, heat dissipation, fire prevention, extrusion, and dropping. In order to improve the overall performance of the battery pack and enhance the adaptability of the battery pack for electric tools to harsh working conditions, the above-mentioned factors need to be considered comprehensively.

[0003] This part provides background information related to the present application, which may not be prior art. CONTENT OF THE UTILITY MODEL

[0004] An object of the present application is to solve or at least alleviate part or all of the above problems. To this end, the present application provides a battery pack. The present application adopts the following technical solutions:

[0005] A battery pack, characterized in that it comprises: a shell; a plurality of battery cells arranged in the shell; a combination part arranged to be coupled to an electric device to transmit electric energy; the combination part comprises: a terminal assembly arranged to be electrically coupled to the electric device; a support part providing support for the connection of the electric device and the battery pack; wherein the support part comprises a support cavity and a reinforcing member contained in the support cavity; the reinforcing member is made of the same material as the shell.

[0006] In some embodiments, the reinforcing member is embedded in the support cavity.

[0007] In some embodiments, the reinforcing member is interference-fitted with the support cavity.

[0008] In some embodiments, the reinforcing member is arranged in a solid structure.

[0009] In some embodiments, the reinforcing member is an independent component installed in the support cavity.

[0010] In some embodiments, the reinforcing member has a porous structure.

[0011] In some embodiments, the length of the reinforcing member is less than the length of the support cavity.

[0012] In some embodiments, the length of the reinforcing member is greater than the length of the support cavity.

[0013] In some embodiments, the length of the reinforcing member is substantially the same as the length of the support cavity.

[0014] In some embodiments, the length of the support cavity ranges from 40mm to 250mm.

[0015] In some embodiments, the weight of the battery pack is greater than or equal to 1kg.

[0016] In some embodiments, the reinforcement comprises a first piece and a second piece; the first piece and the second piece are respectively embedded in the support cavity.

[0017] In some embodiments, the material of the reinforcement comprises at least one of polypropylene (PP), polycarbonate (PC) + ABS, polycarbonate (PC) + nylon or other polycarbonate (PC) composite materials.

[0018] A battery pack suitable for power tools, comprising: a housing; a plurality of battery cells arranged in the housing; a coupling portion arranged to be coupled to a power tool; the coupling portion comprises: a terminal assembly arranged to be electrically coupled to the power tool; a support portion capable of providing support for the connection between the power tool and the battery pack; wherein the support portion comprises a support cavity and a reinforcement contained in the support cavity; the material of the reinforcement is the same as the material of the support cavity.

[0019] The application has the advantages that: the material of the reinforcement in the support cavity is set to be the same as the material of the housing, that is, the overall strength of the support portion can be increased by embedding the reinforcement, appearance defects caused by excessive injection molding are avoided, and the material recycling of the battery pack is facilitated, and the battery pack housing does not need to be recycled separately. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the battery pack in the application as an embodiment;

[0021] Figure 2 is a scene schematic diagram of the battery pack in the application for supplying power to a power tool;

[0022] Figure 3 is Figure 1 is a perspective view of part of the internal structure of the battery pack shown in the figure;

[0023] Figure 4 is Figure 1 is a side perspective view of the battery pack shown in the figure;

[0024] Figure 5 is Figure 1 is a half-sectional view of part of the structure of the battery pack shown in the figure. DETAILED DESCRIPTION

[0025] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described drawings.

[0026] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0027] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0028] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0029] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0030] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0031] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and the like are described in the orientation and positional relationship shown in the drawings, and should not be understood as limiting the embodiments of the present application. In addition, it is also understood in the context that when referring to an element connected to another element "on" or "under", it can be directly connected to another element "on" or "under", or indirectly connected to another element "on" or "under" through an intermediate element. It should also be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like not only represent the positive direction, but also can be understood as the side direction. For example, the lower side can include the directly below, left below, right below, front below and back below, etc.

[0032] As shown in Figures 1 to 2 The present application mainly provides a battery pack 100, which supplies power to an electrical device. The battery pack 100 transmits electrical energy to the electrical device to power up the electrical components in the electrical device. In the present embodiment, the electrical device is an electric tool 200. The battery pack 100 is an example of a battery pack for the electric tool 200. The battery pack 100 can be detachably connected to the electric tool 200 to supply power to the electric tool 200. The relevant design needs to adapt to various working conditions of the electric tool 200.

[0033] Referring to Figure 2 The electric tool 200 receiving the power supply of the battery pack 100 of the present application can be various types of electric tools 200, including but not limited to Figure 2The shown electric power tools 200 can include a riding lawn mower 200a, a hand-held power tool 200b, a chain saw 200c, a lawn blower 200d, a blower 200e, and an all-terrain vehicle 200f. In some embodiments, the electric power tools 200 powered by the battery pack 100 of the present application can include hand-held power tools, including a trimmer, a circular saw, etc. In some embodiments, the electric power tools 200 powered by the battery pack 100 of the present application can include bench tools, including a miter saw, a metal cutter, etc. In some embodiments, the electric power tools 200 powered by the battery pack 100 of the present application can include hand-push or riding tools, including a hand-push lawn mower, a hand-push snow blower, or a riding lawn mower, a stand-on lawn mower, etc. In some embodiments, the electric power tools 200 powered by the battery pack 100 of the present application can include outdoor wheeled tools, including a farm vehicle, a golf cart, etc. In some embodiments, the electric power tools 200 powered by the battery pack 100 of the present application can include robotic tools, including a lawn mower robot, a snow blower robot, etc. Alternatively, in some embodiments, the electric power tools 200 can be garden tools, including a trimmer, a blower, a lawn mower, a lawn blower, etc. In some embodiments, the electric power tools 200 can be decoration tools, including a screwdriver, a drill, a nail gun, a glue gun, a sander, a circular saw, etc. In some embodiments, the electric power tools 200 can be cleaning tools, including a blower, a snow blower, a cleaning machine, etc. Alternatively, in some embodiments, the electric power tools 200 can be cutting tools, including a jigsaw, a scroll saw, a circular saw, a chain saw, etc. In some embodiments, the electric power tools 200 can be fastening tools, including a drill, a screwdriver, an electric hammer, etc. In some embodiments, the electric power tools 200 can be polishing tools, including an angle grinder, a sander, etc. In some embodiments, the electric power tools 200 can be other tools, such as a lamp, a fan, etc. It can be understood that the electric power tools 200 powered by the battery pack 100 of the present application can be of more types not shown before, provided that the characteristics do not contradict.

[0034] The electric power tools 200 generally have a battery mounting portion 201 to which the battery pack 100 can be detachably connected. The specific position and structure of the battery mounting portion 201 can be different for different electric power tools 200, and the arrangement of the electric power tools 200 themselves can also be different. For example, the riding lawn mower generally has a frame, a traveling assembly including at least a traveling wheel and a traveling motor, and a cutting assembly including at least a blade and a cutting motor. The battery mounting portion 201 is generally located at the front or rear of the frame, and the details are not described herein.

[0035] In some embodiments, the electric device can also include some energy conversion devices, such as an adapter or an inverter, which can convert the electric energy output by the battery pack 100 to power other electric power tools 200.

[0036] In one embodiment, the nominal voltage of the battery pack 100 is greater than or equal to 56V. In some embodiments, the nominal voltage of the battery pack 100 is greater than or equal to 50V. In some embodiments, the nominal voltage of the battery pack 100 is greater than or equal to 48V. In some embodiments, the nominal voltage of the battery pack 100 is greater than or equal to 40V. In some embodiments, the nominal voltage of the battery pack 100 is greater than or equal to 36V. In some embodiments, the nominal voltage of the battery pack 100 is greater than or equal to 30V. In some embodiments, the nominal voltage of the battery pack 100 is greater than or equal to 20V. In some embodiments, the nominal voltage of the battery pack 100 is greater than or equal to 10V.

[0037] As Figure 1 and Figure 3 The battery pack 100 includes a housing 10 and a plurality of battery cells 20. The battery cells 20 are components that store electrical energy within the battery pack 100. In some embodiments, the battery cells 20 can be cylindrical batteries, or can be square batteries, or can be soft-pack batteries. In some embodiments, the battery cells 20 can be single-pole ear batteries, or can be double-pole ear batteries, or can be multi-pole ear batteries, or can be full-pole ear batteries. In some embodiments, the battery cells 20 described above can be lithium iron phosphate battery cells, or can be ternary lithium battery cells. In some embodiments, the battery cells 20 described above can also be sodium ion battery cells. In some embodiments, the characteristics of the plurality of battery cells 20 within the battery pack 100 can be different or partially different. The specific number of battery cells 20 within the battery pack 100 can be adjusted within a certain range, and the plurality of battery cells 20 can form one or more battery cell modules 100a.

[0038] In some embodiments, the cells 20 are configured as cylindrical 18650 cells 20 (18 mm diameter, 65 mm length). In other embodiments, the cells 20 are configured as cylindrical 14500 cells 20 (14 mm diameter, 50 mm length), 14650 cells 20 (14 mm diameter, 65 mm length), 17500 cells 20 (17 mm diameter, 50 mm length), 17670 cells 20 (17 mm diameter, 67 mm length), 18500 cells 20 (18 mm diameter, 50 mm length), 26650 cells 20 (26 mm diameter, 65 mm length), 26700 cells 20 (26 mm diameter, 70 mm length), etc. Each cell 20 can be generally cylindrical and can extend along a cell axis parallel to a cylindrical outer cell wall. In some embodiments, in the battery pack 100, each cell 20 can have a cell 20 length greater than or equal to twice the cell 20 diameter. In some embodiments, the cells 20 are configured as lithium-based prismatic cells 20 (e.g., battery capacities between 1.0 ampere-hour (“Ah”) and 10.0 Ah), having, for example, a length of about 50 mm to about 80 mm, a width of about 60 mm to about 90 mm, and a height of about 3 mm to about 8 mm. In some embodiments, the battery pack includes, for example, a wound configuration, a wound and flattened configuration, a wound and folded configuration, or a layered and folded configuration to implement the prismatic cells 20.

[0039] In the present embodiment, each cell 20 has a positive and a negative electrode, the cells 20 are electrically connected in series, in parallel, or in a series-parallel hybrid manner within the same cell module 100a, and the cell modules 100a are electrically connected in series or in parallel between different cell modules 100a. Ultimately, the total positive and negative terminals of the battery pack 100 can be formed, i.e., the total positive and negative terminals of the battery pack 100 that perform power feeding to the outside are formed, which belong to the terminal assembly 30 of the battery pack 100.

[0040] As Figures 4 to 5As shown, the battery pack 100 includes a coupling portion 40 that is coupled to an electrical device to transmit electrical energy, for example, the coupling portion 40 of the battery pack is detachably connected with the battery mounting portion 201 of the power tool 200, when the coupling portion 40 of the battery pack is coupled with the battery mounting portion 201 of the power tool 200, the electrical energy in the battery cell 20 is transmitted to the power tool 200 through the coupling portion 40. The coupling portion 40 is at least partially disposed in the housing 10. The coupling portion 40 includes a terminal assembly 30 and a support portion 41, wherein the terminal assembly 30 is electrically coupled with the electrical device. The terminal assembly 30 includes the above-mentioned total positive and negative terminals of the battery pack 100 that are externally fed with electricity.

[0041] The support portion 41 at least provides support for the connection of the electrical device and the battery pack 100. In some embodiments, the support portion 41 supports the battery pack 100 on the power tool 200 and connects or releases the battery pack 100 from the battery mounting portion 201 of the power tool 200. The support portion 41 is at least partially formed in the housing 10. The support portion 41 includes a support cavity 411 and a reinforcing member 412 accommodated in the support cavity 411, the reinforcing member 412 is made of the same material as the housing 10. Wherein, the support cavity is formed inside the support portion, that is to say, the support cavity is a cavity structure formed in the support portion housing.

[0042] When the battery pack 100 is installed on the electrical device or the power tool 200 and put into use, the support portion 41 plays a crucial role. It is not only the key component for connecting the power tool 200 and the battery pack 100, but also ensures that the battery pack 100 can be stably held on the power tool 200 by cooperating with the locking structure of the battery pack 100. However, during the actual use of the power tool 200, especially in a vibrating or jolting environment, the weight of the battery pack 100 itself will generate additional load on its connection structure. If the strength of the support portion 41 is insufficient, it may cause damage to the support portion 41, and even cause the serious consequence of the battery pack 100 falling off the power tool 200. This problem not only affects the normal use of the device, but also may pose a threat to the safety of the user.

[0043] In the related art, in order to enhance the strength of the support portion 41, a metal material is usually embedded in the support portion 41. The high strength and rigidity of the metal material can effectively improve the carrying capacity of the support portion 41, thereby avoiding damage to the support portion 41 under vibration or impact. However, such a design, although solving the strength problem, brings new challenges. As a kind of waste that needs special treatment, the recycling and processing of the battery pack 100 puts strict requirements on environmental friendliness. Embedding metal materials in the support portion 41 will increase the difficulty of recycling the battery pack shell 10, because metal and plastic materials need to be separated and processed, which not only reduces the recycling efficiency, but also increases the recycling cost. In addition, the introduction of metal materials also does not meet the current concept of environmental sustainability, which may cause additional burden to the environment.

[0044] In the present embodiment, the applicant proposes an innovative solution from the overall strength, economy and environmental friendliness of the battery pack 100 and other aspects. Specifically, the material of the reinforcing member 412 in the support cavity 411 is the same as the material of the battery pack shell 10. Such a design not only avoids embedding metal materials in the support portion 41, but also improves the strength of the support portion 41 through optimized structural design. For example, the reinforcing member 412 can be made of the same high-strength engineering plastic as the shell 10, and is tightly combined with the support portion 41 through injection molding process. Such an integrated design not only simplifies the manufacturing process, but also significantly improves the overall strength of the support portion 41, so that it can effectively resist vibration and impact.

[0045] In addition, such a design also avoids the appearance defect problem caused by the over-thick injection molding process. In the traditional design, in order to increase the strength of the support portion 41, the injection thickness may need to be increased, which may cause surface unevenness or shrinkage and other appearance problems. By embedding the reinforcing member 412, the strength can be improved without increasing the injection thickness, thereby ensuring the appearance quality and aesthetics of the battery pack 100.

[0046] For example, such a design has significant advantages in material recycling. Since the reinforcing member 412 and the battery pack shell 10 are made of the same material, the battery pack 100 can be directly recycled as a whole after being scrapped, without the need to separate metal and plastic materials. This not only simplifies the recycling process, but also improves the recycling efficiency, while reducing the negative impact on the environment, in line with the concept of sustainable development.

[0047] In this embodiment, by unifying the material of the reinforcing member 412 with the material of the battery pack shell 10, not only does the strength of the support portion 41 improve, but also the economy and environmental friendliness are taken into account. This design not only solves the recycling problem caused by metal insertion in traditional technology, but also provides a new idea for the overall performance optimization and sustainable development of the battery pack 100. Through this innovative design, the battery pack 100 not only meets the high strength demand, but also contributes to environmental protection and efficient use of resources.

[0048] In this embodiment, at least one side of the shell 10 is configured with a combination portion 40, which at least includes a terminal assembly 30 exposed outside the shell 10. In one embodiment, referring to Figure 1 and Figures 4 to 5 , a combination groove 42 with a similar inverted "U" shape is formed between the two support portions 41, the combination groove 42 includes two opposite side groove walls 421 and a top end wall 422, and the opening of the combination groove 42 faces the outside of the battery pack 100. At least one side groove wall 421 of the combination groove 42 is recessed inward to form a mounting rail 4211 that can guide the battery pack 100 when it is mounted on an electronic device. The combination groove 42 is mounted with a terminal assembly 30 at one end. In one embodiment, one end of the shell 10 is provided with a terminal mounting hole 423, and the terminal assembly 30 can be mounted on the shell 10 through the terminal mounting hole 423. One end of the terminal assembly 30 can be arranged inside the shell 10, and one end is exposed outside the shell 10, so there is a mounting gap between the terminal assembly 30 and the shell 10.

[0049] Referring to Figure 5 , the support cavity 411 of the shell 10 forms the support portion 41, and the reinforcing member 412 is embedded in the support cavity 411. In this embodiment, the reinforcing member 412 is an independent component mounted in the support cavity 411. For example, the reinforcing member 412 is embedded in the support cavity 411, such as bonding, attaching or fastening. For example, the support cavity 411 includes a closed cavity formed by the shell 10 with a wall thickness, and the reinforcing member 412 is completely enclosed in the support cavity 411. In some embodiments, the support cavity 411 can be a semi-closed cavity, and the reinforcing member 412 is at least partially exposed outside the support cavity 411. In some embodiments, the reinforcing member 412 is at least partially exposed outside the shell 10. In some embodiments, the reinforcing member 412 is interference fit with the support cavity 411 to reduce the gap between the reinforcing member 412 and the cavity wall of the support cavity 411 to increase the strength.

[0050] In this embodiment, the support part 41 is at least partially formed with the housing 10, and the constituent material of the housing 10 includes polypropylene (PP), polycarbonate (PC) + ABS (Acrylonitrile Butadiene Styrene plastic), polycarbonate (PC) + nylon or other PC composite materials. For the reinforcing part 412, the constituent material includes polypropylene (PP), polycarbonate (PC) + ABS (Acrylonitrile Butadiene Styrene plastic), polycarbonate (PC) + nylon or other PC composite materials, and the material of the reinforcing part 412 is the same as the constituent material of the housing 10. In some embodiments, the reinforcing part 412 includes nylon with glass fiber (PA6+GF) to further flame retardant. In this embodiment, the reinforcing part 412 is provided in a solid structure, and the inside of the reinforcing part 412 is completely filled with material without a cavity or gap structure, thereby improving the strength and rigidity. In some embodiments, the reinforcing part 412 can also have a porous structure, such as a honeycomb structure.

[0051] In this embodiment, the reinforcing part 412 is composed of a first piece 4121 and a second piece 4122, which have basically consistent structure design and are symmetrically embedded in two independent support cavities 411, respectively. This symmetrical design not only makes the reinforcing part 412 more convenient to install, but also ensures the balance and stability of the overall structure. The symmetrical distribution of the first piece 4121 and the second piece 4122 enables them to evenly share external loads when stressed, thereby effectively avoiding damage caused by local stress concentration. In addition, this design can also simplify the manufacturing and assembly process, because the first piece 4121 and the second piece 4122 can use the same processing technology and size standard, thereby reducing production cost and improving production efficiency.

[0052] Taking the first piece 4121 as an example, the specific structure of the reinforcing part 412 includes a first embedding end 4123 arranged on one side of the mounting rail and a second embedding end 4124 arranged on the other side of the mounting rail. The design of these two embedding ends enables the reinforcing part 412 to be firmly fixed on the outer circumferential side of the mounting rail 4211. Specifically, the first embedding end 4123 and the second embedding end 4124 are basically wrapped around the outer circumferential side of the mounting rail 4211, forming a tight wrapping structure. This design not only enhances the connection strength between the reinforcing part 412 and the mounting rail 4211, but also effectively prevents the reinforcing part 412 from loosening or falling off during installation or use.

[0053] Exemplarily, the mounting rail 4211 is substantially in the shape of a U-shaped groove structure, while the first embedded end 4123 and the second embedded end 4124 of the reinforcing member 412 form a groove structure substantially consistent with the shape of the mounting rail 4211. This matching design in shape enables the reinforcing member 412 to closely fit the outer surface of the mounting rail 4211, thereby further improving the stability and reliability of the connection. In addition, this groove structure can also provide additional support area for the reinforcing member 412, thereby enhancing its bending and torsion resistance.

[0054] The support cavity 411 protrudes inwardly from the top end wall 422 of the combination groove 42, and the reinforcing member 412 is at least partially located below the top end wall 422 in the up-down direction. This layout design enables the reinforcing member 412 to make full use of the internal space of the combination groove 42, thereby improving its strength and stability without increasing the overall structure size. At the same time, this design can also ensure that the reinforcing member 412 does not protrude from the external contour of the combination groove 42 after installation, thereby maintaining the aesthetics and compactness of the overall structure.

[0055] The reinforcing member 412 in this embodiment achieves efficient, stable and reliable connection through the symmetrical design of the first piece 4121 and the second piece 4122, the close wrapping structure of the first embedded end 4123 and the second embedded end 4124, and the precise matching with the mounting rail 4211 and the support cavity 411. This design not only simplifies the installation process, but also significantly enhances the strength and stability of the overall structure, thereby meeting the demand for high performance and high reliability in actual applications.

[0056] In some embodiments, the first piece 4121 and the second piece 4122 are designed to have different structural features, and this differentiated design is mainly to meet specific functional requirements and installation convenience. For example, in order to ensure correct and error-free assembly during installation, the first piece 4121 and the second piece 4122 can be respectively provided with different foolproof structures. The design of foolproof structure is a common engineering optimization method, which aims to avoid possible errors in the installation process through the limitation of physical structure. Specifically, the foolproof structure can include asymmetric buckles, unique positioning grooves or special-shaped interfaces, etc., which enable the first piece 4121 and the second piece 4122 to be installed only in the correct direction and position, thereby effectively preventing assembly errors or damage due to misoperation.

[0057] In addition, the structure of the support cavity 411 of the support part 41 can also vary depending on functional requirements. As the mounting base of the first piece 4121 and the second piece 4122, the internal structure of the support cavity 411 directly affects the mounting method and stability of the assembly. Due to the structural differences of the support cavity 411, the first piece 4121 and the second piece 4122 also need to adjust their structures accordingly to ensure that they can perfectly match the support cavity 411. For example, if the internal profile of the support cavity 411 has specific geometric shape or size requirements, the shape and size of the first piece 4121 and the second piece 4122 will also be precisely designed according to these requirements to ensure that they can be firmly fixed in the support cavity 411 after installation.

[0058] It can be understood that the structural design of the first piece 4121 and the second piece 4122 in the support cavity 411 is highly coordinated, and their shape and size will be precisely adjusted according to the specific structure of the support cavity 411. This design not only ensures the installation accuracy of the assembly, but also improves the overall structural stability and functionality. Specifically, the outer surface of the first piece 4121 and the second piece 4122 will closely fit the inner wall of the support cavity 411, thereby reducing the looseness or shaking phenomenon after installation. In addition, this fitting design can also increase the contact area between the assemblies, further enhancing the firmness and reliability of the connection.

[0059] Further, the structural differences of the first piece 4121 and the second piece 4122 can also be related to their functional division in the overall device. For example, the first piece 4121 may assume the main support function, so its structural design will focus more on strength and stability; while the second piece 4122 may assume more auxiliary functions, such as adjustment or fixation, so its structural design may be more flexible or lightweight. This differentiated design not only optimizes the performance of the assembly, but also improves the use efficiency and life of the overall device.

[0060] In summary, the structural design of the first piece 4121 and the second piece 4122 is a direct reflection of the structural design of the support cavity 411, and there is a close correspondence between the two. Through this coordinated design, not only can the precise installation of the assembly be achieved, but also the functionality and reliability of the overall device can be ensured, thereby meeting the diversified needs in actual applications.

[0061] In some embodiments, the first piece 4121 and the second piece 4122 are tightly connected by a connecting structure, forming an integrated structure. This design not only simplifies the installation process, but also significantly enhances the stability and strength of the overall structure. Specifically, the first piece 4121 and the second piece 4122 are respectively embedded in the support cavity 411, and their shapes and sizes match the internal profile of the support cavity 411 to ensure accurate positioning and stability during installation. The first piece 4121 and the second piece 4122 are fixed together by connecting elements or connecting structures (such as bolts, buckles, or welding, etc.), so that they form an inseparable integrated structure. This integrated design not only reduces the installation steps, but also avoids the problem of structural failure caused by loose or misaligned components.

[0062] In addition, the formation of this integrated structure further enhances the mechanical properties of the overall device. For example, when subjected to external loads or vibrations, the connection between the first piece 4121 and the second piece 4122 can effectively disperse stress and prevent damage caused by local stress concentration. At the same time, the rigidity of the integrated structure is significantly enhanced, thereby improving the durability and reliability of the device. By connecting the first piece 4121 and the second piece 4122 into an integrated structure, not only is the installation process simplified, but the strength and stability of the overall structure are significantly improved, thereby meeting the high requirements for performance and reliability in actual applications.

[0063] In the present embodiment, the length of the support cavity 411 ranges from 40 mm to 250 mm. In some embodiments, the length of the support cavity 411 ranges from 100 mm to 250 mm. In some embodiments, the length of the support cavity 411 ranges from 130 mm to 250 mm. The length of the reinforcing member 412 is less than the length of the support cavity 411. In some embodiments, the length of the reinforcing member 412 is greater than the length of the support cavity 411. In some embodiments, the length of the reinforcing member 412 is substantially equal to the length of the support cavity 411.

[0064] In the present embodiment, the weight of the battery pack 100 is greater than or equal to 1 kg. In some embodiments, the weight of the battery pack 100 is greater than or equal to 1.5 kg. In some embodiments, the weight of the battery pack 100 is greater than or equal to 2 kg. In some embodiments, the weight of the battery pack 100 is greater than or equal to 2.5 kg. In some embodiments, the weight of the battery pack 100 is greater than or equal to 3 kg. In some embodiments, the weight of the battery pack 100 is greater than or equal to 3.5 kg. In some embodiments, the weight of the battery pack 100 is greater than or equal to 4 kg. In some embodiments, the weight of the battery pack 100 is greater than or equal to 4.5 kg. In some embodiments, the weight of the battery pack 100 is greater than or equal to 5 kg.

[0065] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present application.

Claims

1. A battery pack, characterized by, The battery pack comprises: a housing; a plurality of battery cells arranged in the housing; a coupling portion arranged to be coupled to an electrical device to transmit electrical energy; the coupling portion comprises: a terminal assembly arranged to be electrically coupled to the electrical device; a support portion arranged to provide support for at least the connection of the electrical device and the battery pack; wherein the support portion comprises a support cavity and a reinforcing member accommodated in the support cavity; the reinforcing member is made of the same material as the material of the housing.

2. The battery pack of claim 1, wherein, The reinforcing member is embedded in the support cavity.

3. The battery pack of claim 1, wherein, The reinforcing member is interference-fitted with the support cavity.

4. The battery pack of claim 1, wherein, The reinforcing member is arranged in a solid structure.

5. The battery pack of claim 1, wherein, The reinforcing member is arranged as an independent component in the support cavity.

6. The battery pack of claim 1, wherein, The length of the reinforcing member is less than the length of the support cavity.

7. The battery pack of claim 1, wherein, The length of the reinforcing member is greater than the length of the support cavity.

8. The battery pack of claim 1, wherein, The length of the reinforcing member is substantially the same as the length of the support cavity.

9. The battery pack of claim 1, wherein, The length of the support cavity ranges from 40mm to 250mm.

10. The battery pack of claim 1, wherein, The weight of the battery pack is greater than or equal to 1kg.

11. The battery pack of claim 1, wherein, The reinforcing member comprises a first member and a second member; the first member and the second member are respectively embedded in the support cavity.

12. A battery pack suitable for an electric power tool, comprising: a housing; a plurality of battery cells arranged in the housing; a coupling portion arranged to be coupled to an electric power tool; the coupling portion comprises: a terminal assembly arranged to be electrically coupled to the electric power tool; a support portion arranged to provide support for at least the connection of the electric power tool and the battery pack; wherein the support portion comprises a support cavity and a reinforcing member accommodated in the support cavity; the reinforcing member is made of the same material as the material of the support cavity.

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